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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c19a73831ffa39ee1452ed6bbe212ffa9d80508ffd32c1a78f1ed4a3780ee5' 
  AND token = '88Mwd0vg5kEdbvrtLN59gojo1K2b/hUxReD9uWzZFkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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