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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aac566fd7baac991926a47f5742123430292980f306a7f2707965dd3aa88819' 
  AND token = 'NYZF/nrsL6dSQ121b4XZswq9MAVQO+e+OL45Q4veUrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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