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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fa7f8a4dc4c314a376c14fe9fd534e49d2d4d63a7be21b74ec8c21c2d042ad' 
  AND token = 'mxdWJfGZXtra2b6iHNJ3awRCokkpHBFRsJ15/afJQik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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