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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93fb3b1dd3c99b052f9aa2a828aaa8f79688f96cf78091b6bdf636b80fcc2b7' 
  AND token = 'rSJ2wDC20hsClB/a9LTqtdW9p+BkR/whoSAMsyGNq5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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