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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dc0504e00bd496473790bf26d786ea4ea3f6ebed44af56fe17a135e70816ad' 
  AND token = 'vN5pTC+tkD8PNNqN1+3mNHSz/tn/yffDHAMyAdTlRRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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