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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bacea9f62ff3bbf6a386d5a9a0163491a0c069812af81c6e5d62ca2e7ef71b' 
  AND token = 'CvdCXW8tTxKa8/NAzUOn1QVTbtWzKe3zpRCKqVnWwPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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