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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b27fc5a580dd03832ba052862a28284cb6fca9e042d2b72341fdd4678d6a0c' 
  AND token = '8W4J7EjfNr3xj8BcpDYnea2uQz5ftNEOOlxhuOSgkuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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