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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea2e65eb3178d9c267a45d1bf47089ec92204c4f96a77db383888cecfb8cc4c' 
  AND token = '62znMhnBrygAl2mTu6QztmOIMWwtXiISFWjr5Pc01zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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