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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5711fecf574cafd7fc649ac03e71cd3b1ce8da9adf2454924709696d4ac91b0a' 
  AND token = 'vk7N97ywTsHXRHLzt6RcrD/O7lNQq/zK2x8q6D1IawA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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