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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d52b89bfc7fa8d302ce69b5f83584c8f10cc1fb43ed1c5770f98507479ea3e' 
  AND token = 'tZx/A09x6fzql/1VYGo5k064j5xpSs+E6mnr31+5ZlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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