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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa7935028e5559c1be590d24dae11a27d860ed53c15d73d366e5d63fb583aee' 
  AND token = 'JoGFarLkbt/5jyS1CQVBBeBffRDYcLM7n4nl5zVuUWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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