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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117b1a56abe4ced3df0233dc5313e3a76ecd78507cae9aaa8e198901a8d484e6' 
  AND token = '3THug0AV19rfPm4h2nfxFElIQkXSDaiGwBUgBlwQeqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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