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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0b4a4c52ca00eb929477cc4d7d40a3983fd442ac9f5a7fef661684e9ef5d58' 
  AND token = 'VBwmcQwUOaQg8/WNS8PYKyhph/U9gTWObPW6E1GNE+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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