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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6a9c5a43d3fcbded3dac3d725cb02ddcd6fb8fc7fd3c5b50584582858297c2' 
  AND token = 'Cuf8dGe+dvaKAZD7z01fJW+IgT/6euhhwMTUeOIAaQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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