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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4b6b6139dd60ab5db70f72a0aea23404d1c928a2d852fde6cd59a2517a33b9' 
  AND token = 'd02XcHVbh+h/3vdBeZUGZNJu7w7CKIefNQR4Kq/CfeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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