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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd024191caf0825a1626b0b19cc94eb48c6901f0993a30c65c030a507d0d737b2' 
  AND token = '3MyDQCeNu9kV7oYiNu4jejh5lIDRmXZYWBT/vdrKiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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