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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0009683603cc488aacc15543a08adf37da671c187d93b0c619dfbf7ac2364e' 
  AND token = 'Hh/Tqzb6mIISF6L1uGNM6joy26J8jyThb1vKWDSHi+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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