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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b819365215130aa2ca34101c3b68da2cf80e08f82cd030ab74d7756c6551ce91' 
  AND token = 'jBdNl0GHNebVbaQsL77JO8RDMYF8d0aOqkRsHM2OiBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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