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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4cd8a3841e70cbebeda0bb475c1fd7e5159f322a9587055b101dec89d21dd2' 
  AND token = 'CLh43ujCNNzkvVb7C0Jm7bNwgHK0wC4314iUl1LZDVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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