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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9143c45280458ecaa70c6ea488c779c79b52551997785942686492ef7e2f960' 
  AND token = 'NA7A18nqsaUb1quLmj30VvDeC7kZ81xRHOvGj2CSWBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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