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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c666f5b66b43d1b47ce8e1df7451e41182cd3b493adb8f7b3c94a10d23a0da' 
  AND token = 'qVtX323fAB1qqHbU1bOhQqI/NepXc+IKyDo9dy8I/s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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