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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d90d298cf0ecd0dc0b43ee5de0bd4bbce89be9bd0ce4287a270fb4c60f74a63' 
  AND token = '7CRqCgz76RgiEuFcV47Z+Q+Q5YixHCxjgLZKX0f3ysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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