Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c5155fd8a719fa0f8b5fa527e02336fa70f64848db603d64d256327284af11' 
  AND token = 'mcYo0NzG5o9ekEfIKb7XP8cg2lItCTtL4fFzghyLTJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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