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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3151fd30167a81781aaa206a4e1e71c3bc4acf3b46fbe904e39270d03a95e38b' 
  AND token = 'lcc69qTeyWnJDYsNAEr8u9m7R8XPt4d1qtWVosXsyX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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