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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb74a9d9f8b5ef500fb312223bdca04107b7ae6f7d965b71f83dbe861ce11ee' 
  AND token = 'DQIaNQTb4k7NYK5JK9Esz0UJCly++ECoyJ12Zvl4/K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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