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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7724e93e055d9bd7bd8eb58c0537e156246631f869962a00539d396118de388' 
  AND token = 'q6hz0kwNrS28/3jPmgJ00khfq0S/EFBy22LLtpU1ULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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