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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442d41cf0e30276f041be0c31c483ae307307f7f8eb9aaaf8b0e5ee5fb736f9d' 
  AND token = 'HEfl8hRpNlrJKNkT2kXuC6w0a9Gw66QDZRWakTOVW0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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