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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfae9cda0ac5b6625fc5c5b1a1b5d7e58c3c3b5c30d6893304963d44d5862ac6' 
  AND token = 'qVZpWPjIt5KRoS18dlTvJ1njaLSCya/CGlNAgCdEIaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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