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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27089950cf9f70b582129561a846a4b8ca42f16ac684e9e0ec75f9adfe3906c' 
  AND token = 'BOrJNl6QO/IV67QF6SPZ3a3ITqh2QWxXiw7R6cPIcr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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