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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451408cc7caba387af375907a7444d754798e773de089cc8b5dd03ed3ad15026' 
  AND token = 'L3aHPP5IPf/2EbFpLIwYURiO1nO1WaChnvefWbKReFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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