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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5120890da52a1e04d4d7a193720aec2c83ffe5a78750ce6ea483dd5fcaa68b' 
  AND token = 'q/nJYt7JsLo5r3cPp52EH8iHWB/xNmmVPbUwlqdwWjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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