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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5959eae29fb3249aab87577be784b922b174458e693679223a46c1786b495b34' 
  AND token = '3RrePGlxM2bqmNAWVyGmjIzfUS/1guxp60jp4F8VVuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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