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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80290cf9950e9906aa15718240385f51d1ab7ec6dafbef073f8b72f834e89a5c' 
  AND token = 'BH1MrBDBLwuZwQd2FrjYN8ptW18+P3Lq3pGhLunHd10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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