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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea54f66061803302ed3eb826e745ab01a9a923e8e0c7ef3c73d514f178145a7b' 
  AND token = 'NlMP2Q3m8kgIkdEEhKodgp4/pEOlidbdZfkEBxyfRHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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