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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2bcf49279076a179068a1d1250d68bdc5663e862841241d0b3fa176f6fb6fc' 
  AND token = 'HC2NJBB9svfya6YM72H7I+feRItzU3V+oLTP8LONKRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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