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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1882a73cb1992823490134071d9e476613cd6c0cd4e12427c7ecf9ace45059' 
  AND token = 'kuWQEYrehH3u9bbxAHiyhMKrVC3erMMSEgkzpPLebjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}