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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d06d8680dedd30d1a1d6801b141f136b40c0c267249521086541ccf8b4f31d' 
  AND token = 'YUpsKfO6vfvbXg/bO+Nu1fb2xkosqXxftzLIZBQLQB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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