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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87706357311c3323853decdfb5862b386aaff16ad7f706c44366f87cd4b2be6c' 
  AND token = 'FGB4Nit/BdacY+N+332da5FSi2FlUiq50dxg5jtrEGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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