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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6860abaaaf5052896d8b25060c8799491cfafd912b1a4cb240a16bfac09c82ac' 
  AND token = 'iXO61eYl689oy1RFfoUxCpue0WK5zQf6/F9yW1iAxPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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