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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ec2339f9d983e852ff94adf8da2f12e9cb5460b7612741275e9bf0ec909718' 
  AND token = '3Rt7WeS7x2jQ0FkAzaO5tfB6Ef11Shf/7tuYG7dDPj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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