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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f914acaea3b60754663ee78c017d43c743449369336a4bafd69829c508937ffd' 
  AND token = 'FEIedOuqiA1ACDNrFDFs1Yyh5VrNUmIuPy5D+/6xcF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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