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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f5db9bc5cd16c3ab809f8edfd09a7713565f4f054a36bf0ddbd1d0d210b9eb' 
  AND token = 'CIcTSRBhnJXCt4NLfHOPwqFhVMnglIj6hxvjUCl79gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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