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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de98ee9ec4b375b7cb7ed5598c59b8d4ceb715664e68b555f68b8fb4d6f286a6' 
  AND token = '0DwXc7wRoaQ2KJK4irW8LlzWeSYulaWcnYUm9EJt5qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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