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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab28596b9facfee0de4a03a32b70942cb13cdd5585dd52fa7a21b2526083432' 
  AND token = 'Iv4dT0p6mJoUnTVhf4LwTQ+17JKIaTRqNVDbsIST3xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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