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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a82ff5ac1ba04087b0722c4a9722174df5f7d7748fee2806dc0219752e37881' 
  AND token = 'qITsjIy6tSZAS8VqV7Qd3tC58lQy/GGjWg2w7IM4r08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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