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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6c8b1386a0ea03961b90348ced31b0878ab6c13104eda01322820181c18717' 
  AND token = 'KINtliwK1Z8eyQumEw8J8h323t2bDTOkq+QarDvjlps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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