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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478ee0828e1d094aaafdd523f3cb14fef208eee5bd2e6dde901e30c6689983fe' 
  AND token = 'YZ8cYKqdio4M8ev+OZPHZkN59U7nOb0tRavSF6BLG+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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