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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c9d38b16e8e21d49b79f2516b53b9ae230a4e141d16e008ec394ba160aa98e' 
  AND token = 'ygeEOOV5XFM+nIhof9RUNzNtHj72ZbQjZlVO6bboON8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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