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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfc1225edeb5a2cac2a2886a0b768374c8c9029ec690c5cfa04e455ee3a9bae' 
  AND token = '8CwkyY3GMU5RIvRiPhV9ZiNKTQ1aIKadhd+RFtJuHzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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