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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4d5c642506c509ed584734e0c6a80605bf3a90b38a16c3372b717e4a38397e' 
  AND token = 'uH1QECsf1eZRWwcXVjyZoQjGv2PpF+4lwi+YN27ES9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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