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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf5038139cddcf12bb974f6fceb6094d25ba22e5c07a31ed4dfa7e9d03ab042' 
  AND token = 'HSIQu8yU5ocVxwrzsDplXBkwMwLMeGke4YdZb8NqPE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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