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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ccf2c83c7988c2123c4d5eacca93e77973c4a2b6be7df1205d75b3fb550887' 
  AND token = 'VRADq8kQa5OkQCab68W/50/tHiP6heNzQ4BgWVkAVWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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