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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9546f7243dddf56289208f07c901dcba1f4ee07f0de7305eae5d216e5125e9' 
  AND token = 'hugThDNoknT5JtZb8Ib1Y9nJxByvadGMDIp5cu0bj7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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