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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff423258ca04295f1fd73bb163234ba431fd772e8f200378a720caaa5bc71123' 
  AND token = 'fWZtScLahJYjb1XLtlJzirqrEpAPSaOQ5Up2VSFcd6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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