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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff0c1ec6cc1855e714db9dd5469accf29ff5136967e2a0fe770ff5e19eae778' 
  AND token = 'msFFB399HybxLXfv7y/o3togTNNxsjWFpycVx7TPvR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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