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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac56489aa76e23f4ec032c5905dcc346fcf4634742483ca0c9432e417385ac7' 
  AND token = 'U7cqeAaChliFMtTxgvqURMcx/ay5uFYU43QAzpbj0qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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