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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c862b2ef693281abc1500cfe67652abc60b7ac5ab707ce5a610ada56d7496c0' 
  AND token = 'pPboQup2O3Pn2D/JMv9t7/wMgPIv7+A7c3iYzyz2qAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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