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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78256ac9cdb4768a4371879dd0e0a7aae8ac600892f1f3c6ed650b89d63f92b' 
  AND token = '8di500ooOeB+zJxp1TTE8sAY30kpl9flqvsgx8iCDFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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