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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0069a4fac0e0e2792ad76ae1e8cf1ede28c15c830d68f78d297810f9de0ad7c8' 
  AND token = 'SaKY+sG9tveiqXx2T03VwKi41QuTIS6dlqe5dyjrKM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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