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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e68dda2c6f848adf4afc5bdb97b3f0e931d865d0c67cfb64435fc9ef71ab815' 
  AND token = 'T7sq6wbRKzDhAnseexeqeqo69wIkYdojhwfkyZ9bMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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